<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>index</title>
</head>
<body>
  <h1>test jQuery</h1>
  <script src="static/js/jquery-3.6.0.js"></script>
    <script>
        alert('ok')
        $('h1').css('color', 'red')
    </script>
</body>
</html>